NPR’s Andy Carvin on the impact of Twitter on journalism

Twitter and Facebook have been conduits of information throughout the protests in the Arab world. But that news has been atomized, second by second accounts coming from hundreds of unknown sources. Into that relentless stream has stepped NPR’s Andy Carvin, who’s become a one-stop clearinghouse of news by vetting sources and trying to verify individual tweets. Carvin explains how Twitter’s political utility has also created a new kind of journalism.